Automatic devices, measuring and control equipment

Chapter 8 — Automatic Devices Measuring and Control Equipment... 

In the field bus control system, sensor measurement, compensation calculation, engineering quantity processing and control functions in the field of equipment complete, relying on the field devices to complete the basic functions of automatic control, operation state and can at any time... 

Chambers for oxygen consumption measurements are prepared from microscopic slides coated with a thin paraffin film. With a tip of a hypodermic needle held in a micromanipulator, a small round dent of 10—15 pm is made in the paraffin film, and a drop of 40% HF applied to the dent enables the formation of small circular cavities visible after the removal of paraffin. To increase the measuring capacity, an automatic cuvettechanging device has been developed. The object stage maintained at constant temperature by water circulation from a temperature controlled bath, is moved in six discrete steps by a synchronous motor. Thus, oxygen consumption in six different chambers can be assayed simultaneously. The basic equipment used for microspectrophotometric determinations of oxygen consumption does not differ essentially from the equipment used for other purposes, such as cytophotometry (Hamberger et al., 1975). 

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